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FireFox is slow and delayed and laggy on my PC; but no other browser is.

  • 9 replies
  • 2 have this problem
  • 904 views
  • Last reply by cor-el

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I have tried Chrome, Waterfox, Mozilla 64-bit, 32-bit.. uninstalled Flash, reinstalled Microsoft Windows... refreshed FireFox, cleaned out ALL folders of Mozilla Firefox, cleared out extensions. No matter what I do, FireFox lags on my PC.

Chosen solution

[SOLVED] (for me) This seemed to work:

about:config

   network.http.pipelining = true
   network.http.pipelining.ssl = true

as inspired by https://askubuntu.com/questions/459271/mozilla-firefox-terribly-slow-on-ubuntu-14-04

for some reason that made scrolling and text box entry not "laggy"...

EDIT: typo in 'pipelining'

Read this answer in context 👍 1

All Replies (9)

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Do you have the problem on all sites, many, some?

Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options)
key, and then starting Firefox. A small dialog should appear. Click Start In Safe Mode (not Refresh).

Is the problem still there?


https://support.mozilla.org/en-US/kb/firefox-slow-how-make-it-faster

https://support.mozilla.org/en-US/kb/firefox-uses-too-many-cpu-resources-how-fix

https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding

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It's laggy for me too. Even in safemode. A simple scroll up and down usually stutters for a second and then scrolls smoothly for a second and then stutters. Appears to be slightly worse in safe-mode actually. Chrome can smooth scroll the same website all day, up and down without any stuttering.

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Start your Computer in safe mode. Then start Firefox. Try Safe websites. Is the problem still there?

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting Any Computer In Safe Mode; Free Online Encyclopedia

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Chosen Solution

[SOLVED] (for me) This seemed to work:

about:config

   network.http.pipelining = true
   network.http.pipelining.ssl = true

as inspired by https://askubuntu.com/questions/459271/mozilla-firefox-terribly-slow-on-ubuntu-14-04

for some reason that made scrolling and text box entry not "laggy"...

EDIT: typo in 'pipelining'

Modified by codywohlers

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Don't want to be a nitpicker, but there's a little typo in the first preference : It's not 'network.http.pipeling', but 'network.http.pipelining'

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Happy112 said

Don't want to be a nitpicker, but there's a little typo in the first preference : It's not 'network.http.pipeling', but 'network.http.pipelining'

Fixed. Thanks! Accuracy is important in these technical dohickies :)

Modified by codywohlers

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codywohlers That was very good work. Well done. Please flag your https://support.mozilla.org/en-US/questions/1150344#answer-961031 post as Solved Problem so others will know.

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Holy crap this post is so old I completely forgot about it.

Anyhow, turns out after cleaning out my folders, installing the 32 bit FireFox (even on a 64bit machine) and not transferring anything over from other browsers, the lag seems to be non-existent. However, I will also try that pipelining thing.

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Note that support for H1 pipelining will be removed in the next Firefox version (54; #1340655).

Could you please start a new thread for your question?

Then you can provide more information like your operating system and installed extensions and installed plugins.

Modified by cor-el